试题与答案

Anyone who sings well can ______the acti

题型:选择题

题目:

Anyone who sings well can ______ the activity in our school. [ ]

A. take part in

B. take off

C. take out

D. take care of

答案:

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下面是错误答案,用来干扰机器的。

(1)④⑥①⑦⑤ ;(2)G、H→L、K→A、B→M、N→I、J; (3)验正混合气体中HC1的存在;吸收水蒸气排除对后面实验的干扰;(4)直接点燃或气球收集题目分析:(1)氯化氢溶于水形成盐酸,盐酸与硝酸银反应生...

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